Nonaqueous secondary battery

a secondary battery, non-aqueous technology, applied in the direction of cell components, final product manufacturing, sustainable manufacturing/processing, etc., can solve the problems of deteriorating cycle, low electrolyte reltainability, and overcharge characteristic as well as cycle characteristic deterioration

Inactive Publication Date: 2001-06-21
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the microporous film made of polyethylene or polypropylene only keeps the electrolyte in its vacant holes.
Therefore, it was problematic in that it exhibits low reltainability of electrolyte.
This presented a problem of deteriorating overcharge characteristic as well as the cycle characteristic.
However, the non-woven fabric of PP or PET presented a problem of deteriorating the cycle characteristic like the microporous film.
Although the polyvinylidene fluoride resin film provides good electrolyte-...

Method used

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Examples

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example 2

[0031] (2) Example 2

[0032] Non-woven fabric made of polypropylene (PP) 11 having a thickness of 30 .mu.m serving as a reinforcing agent is integrally filled with polyvinylidene fluoride (PVdF) resin 12, thereby preparing a separator of a composite resin film. The separator 10 thus prepared is used as the composite resin film b according to Example 1.

example 3

[0033] (3) Example 3

[0034] Polyvinylidene fluoride (PVdF) resin films 21 and 22 are bonded on both surfaces of a microporous film of polyethylene (PE) having a thickness of 30 .mu.m serving as a reinforcing agent. thereby preparing a separator of a composite resin film. The separator 20 thus prepared is used as the composite resin film b according to Example 3.

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PUM

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Abstract

The nonaqueous secondary battery according to the invention uses a separator 10 which is a composite resin film with a reinforcing material layer 11 integrally filled with polyvinylidene fluoride resin 12 or a separator 20 which is a composite resin film with a polyvinylidene fluoride resin layer 21 and a reinforcing material layer 22 stacked thereon. In this way, when the reinforcing material layer 11 is integrally filled with the polyvinylidene fluoride (PVdF) resin 12, or the reinforcing material layer 22 is stacked on the polyvinylidene fluoride (PVdF) resin layer 21, even if the polyvinylidene fluoride resin swells, its swelling is limited by the reinforcing material layer 11, 21 in the directions of width and length so that the separator 10 or 20 does not wrinkle.

Description

[0001] 1. Field of the Invention[0002] The present invention relates to a nonaqueous secondary battery comprising a negative electrode capable of intercalating / deintercalating lithium ions, a positive electrode having a lithium-containing metal oxide as a positive electrode active material, a nonaqueous electrolyte, and a separator for separating the positive electrode and negative electrode from each other.[0003] 2.Description of the Related Art[0004] In recent years, with remarkable development of reduction of size and weight of an electronic appliance, a battery which is a power source therefor is very greatly demanded to implement reduction of size and weight. In order to satisfy such a demand, a nonaqueous secondary battery which is small in size and light in weight, has a large capacity and is capable of charging / discharging (which is represented by a lithium battery) has been put into practice. This nonaqueous secondary battery has been used in portable electronic / communicati...

Claims

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Application Information

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IPC IPC(8): H01M6/10H01M10/05H01M10/0525H01M10/0587H01M50/414H01M50/449H01M50/457
CPCH01M2/162H01M2/1653H01M2/1666H01M2/1686H01M4/525H01M4/587H01M6/10H01M10/0525H01M10/0587Y02E60/122Y02E60/10H01M50/449H01M50/44Y02P70/50H01M50/457H01M50/414H01M10/058H01M50/426H01M50/463H01M4/131H01M4/133
Inventor NAKAMIZO, SHIORIWATANABE, HIROSHINARUKAWA, SATOSHI
Owner SANYO ELECTRIC CO LTD
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